Brake mechanism



Sept. 23, 1936.. J, sNEED 1,776,274

BRAKE MECHANISM Filed Aug. l.. 1927 2 Shoots-Sheet 1 MW ,JM @QM MMM, M y@my Septzza, 1930. SNEED 1376274 BRAKE MECHANISM Filed Aug. l, 127 2Sheets-Sheet 2 :Jn/manto@ 29 FII Gr. n j 5 J Patented Sept. 23, 1930UNITED STATES PATENT OFFICE JOHN SNEED, 0F DETROIT, MICHIGAN, ASSIGNORTO THE MIDLAND STEEL PRODUCTS COMPANY, OF CLEVELAND, OHIO, A CORPORATIONOF OHIO BRAKE MECHANISM Application filed August 1, 1927. Serial No.209,686.

This invention relates to brakes and more particularly to the shoestructure and adjust- -ing means therefor.

shoe length. Another object is to form an annular shoe which acts as onepiece and which is channel shaped at its adjacent ends. Another vobjectis to secure the adjusting means in the shoe in a manner which will notdetract from flexibility or resiliency of the shoe at that point.

A further object is to position the adjusting means with relation to thecross section of the shoe so that the increase or decrease in the lengthof the shoe occasioned by adjusting will not distort4 the contour of theshoe. Another object is to provide a shoe, which both at its anchorageand throughout its length will be free from angular or lateraldistortion when in operation.

Other objects will appear from the following description of the drawingsdisclosing a preferred form of my invention. The essentialcharacteristics are summarized in the claims.

vIn the drawings, Fig. 1 is an elevation of the assembly; Fig. 2 is asection taken along the line 2-2 in Fig. 1; Fig. 3 is a section takenalong the arcuate line 3-3 in Fig. 1; Fig. 4 is an illustrative channelsection taken along either of the lines 4 4; in Fig. 1; Fig.

5 is a cross section taken along the line 5-5 in Fig. 3; and Fig. 6 is asection taken along the line 6-6 in Fig. 3. y j

Referring particularly to Fig. 1, 'I illustrate a brake' drum D in whichis mounted a brake shoe S. The shoe S comprises two parts, one part ischanneled in cross section 'throughout its length, as shown in Fig. 4..

The channel anges are, in the preferred form, of progressivelydecreasing depth from the point ofanchorage throughout that, part of theshoe. The shoe also consists of a portion 2 which is only partlychanneled in section, having a cross section similar to the crosssection of the portion 1 of the shoe at the `point of anchorage. Themajor portionY of the part 2 comprises a curved band which extendsaround and meets the end of the channeled part 1 of the shoe. Suitablebrake lining L` is carried on the lining supporting surface of the shoe.

An anchor pin A is shown positioned between the free ends of the shoeand may be circular in cross section. Both side flanges of the channeledend-s of the shoe may abut this anchor pin as at 5 and 6 so that eitherend of the shoe may anchor on a pivotal bearing surface with the anchorpin. Theanchor pin may be suitably supported by a backing plate, notshown. A spring G is provided to normally draw both ends of the shoeinto engagement with the anchor pin and out of engagement with the drum.Positioned adjacent the anchor pin, I provide a shoe expanding means(see also Fig. 2), comprising a toggle 10 which may be actuated by acable 11 or other suitable means. The toggle has universal connectionswith both ends of the shoe through the pins 12 and 13, which arepivotally mounted in the side flanges of the shoe; The toggle in turnhas a pivotal engagement with the small pins 14 and 15 extending throughthe major pins 12 and 13.

To adjustthe length of the shoe to compensate for wear, l have devisedmeans illustrated in Figs. 1, 3, 5 and 6. This adjusting devicecomprises a flat curved member 2O which may'advantageously have the samecharacteristics of flexibility and resiliency as the Hat curved portionof the part 2 of theshoe and may be'. secured to the end' of the'part 2of the shoe by suitable means, such as rivets 21. The member 20 may havea small upwardly curved tail piece 22 to which a spring 23 maybesecured. The member 20 serves to join the partsvl andv 2 of the shoetogether andextends over and lies upon the lining su porting portion ofthe lpart 1' of the shoe see Fig. 5). The part -1 of the shoe ispreferably originally formed to be entirely channeled in 'section andend.l ing the lining supportin pieces of the side fianges in the channelare overturned as at 25 (see Figs. 3 and 5) to form inwardly facinggrooves in which the member 20 is held in firm but slidable engagement.The inturned side flanges hold the member 20 against both lateral andradial movement. The end of the member 2() is beveled as at 26 and maybe forced outwardly of thel part l of the shoe by wedge block 27, whichhas a lower face formed complementary to the edge 26 of the member 20.The wedge block is in threaded engagement with the screw 30, which isseated against one of the side ianges of the part 1 of the shoe, as at31, and which is journalled in the other side fiange, as at 32. A squarehead 33 or other suitable means are provided for turning the screw 30.

The wedge block may have an extension 28 to which the other end of thespring 23 is secured so that the wedge block is normally urgedcounter-clockwise onto the member 20 as at 29, maintaining the beveledsurface of the block in engagement with the beveled surface of themember 20. The spring 23 also tends to hold the ends of the separateparts of the shoe together and to force the member 20 against the wedgeblock.

1t will appear from the foregoing that I have provided a substantiallyannular and integral shoe brake, which shoe is adjustable within itselfand has all the characteristics of a single piece shoe. It will furtherappear that such a shoe can be readily formed and quickly assembled, andthat the whole shoe may be quickly assembled in the brake drum andthereafter readily adjusted to any desired length.

Various modifications of this invention will appear vto one skilled inthe art without departing from the spirit thereof. do not care to belimited in the scope of my invention other than by the claims appendedhereto.. i

part, with side anges and a. lining suporting portion, and a fiat curvedpart, the gat curved part having an extension overl ing the liningsupporting portion lof the c annel part, the side anges of the channelpart being inturned to engage the extension of the flat curved part.

2. A brake shoe havin a channel part with side flanges and a iningsupporting portion and a fiat curved band like part of greaterflexibility than the channel part, the

at curved part having an extension overportion of the annel part, andsecured etween the side flanges of the channel part.

3. A brakeshoe having a part` channeled in cross section with inwardlyextending radial side lianges and a curved linin supporting portion, theends of the side anges mmm being inturned to Iorm oppositely facinggrooves, and a member lying upon said 11nlng supporting portion andenga-ged between Y said grooves.

turned to form oppositely facing grooves at A one end and being shapedto form an anchor bearing surface at the other end.

6L A brake shoe being channeled in cross section and having inwardlyextending radial side anges of progressively decreasing depth fromsubstantiall one end to the other, the side flanges o least depth beinginturned to form oppositely facing grooves at the end, said flangesbeing shaped to form anchor bearing surfaces at the other end.

i'. A. substantially annular brake shoe comprising separable partsjoined together end to end, one of said parts being channeled in crosssection, the `other part being essentially fiat and curved.

8. A brake shoe having a fiat curved part and a channeled-shaped part,the parts abutting end to end, and means fixed to one of the said partsand adjustably secured to the other for joining said parts.

9. A brake shoe having a flat curved and a channel shaped part, theparts a utting end to end, and means fixed to the said fiat curved partand adjustably secured to the other part for joining said'partstogether.

l0. A brake shoe cnprising a part channeled in section, having inwardlyextending y radial side flanges and a lining supporting 1. A brake shoehaving a channelled.

portion, said -shoe also comprising another part having an extensionlying between the radial side flanges of the first named part, and meansincluding a screw journalled in the said side flanges for posltioningsaid extension relative to said first named part.

il. A'brake shoe comprising a part channeled in section, having inwardlyextending .radial side fianges and a lining supporting portion, s aidshoe having another part with an extenslon between the radial sidefianges of the first named part, and means includ-` ing a wedge and ascrew journalled in thesaid side flanges for positioning said extensionrelative to said first named part.

12. A brake shoe having a channeled part with inwardly extending radialside fianges and another part having an extension lying between saidradial flanges, the ends of said flanges being inturned to engage saidexart l a between said radial flanges, the ends of said .I flanges beinginturned to engage said extension, said extension having a beveled endand means including a wedge block bearing against the end of saidextension for adjusting said extension relative to said first namedpart, and a screw `journalled in the radially extending portion of said.side flanges for actuatin said Wedge.

14. Arake shoe comprising two parts adjustably joined together, andextension member fixed to one part and having inwardly extendingl tailpiece, said extension member having a beveled end and being inengagement with the other part, a wedge block enga ing the beveled endof said extension mem er and overl in-g it, said wedge block having aninward y extending piece and a spring connected to said piece and to thetail piece of said extension member.

15. A brake shoe comprising two parts adjustably joined together, andextension member fixed to one part and having a beveled end andoverlying the other part, a wedge block engaging the beveled end of saidextension member and overlying it, saidwedge block having an inwardlyextending iece,

and a spring connected to said piece'for olding the block in engagementwith said exy tension member.

1,6. A substantially annular brake shoe partly channeled in crosssection and being -interposed between said dial side Hantghes and acurved lining supporting portion, e ends of the side flanges beinginturned to form oppositely facing grooves, a member lying upon saidlining supporting portion and engaged between lsaid grooves, and meansfor positioning said member 1ongitudinally o f the channeled part.

21.` A brake shoe having apart channeled in cross section with inwardlextending radial side flanges and a curve linin supporting portion, theends of the side anges being inturned to form oppositely facing grooves,a member lying upon sald linin supporting portion and engaged betweensai grooves, and wedging means for positioning said memberlongitudinally of said grooves.

22. A brake shoe formed substantially as a split ring comprising arelativel rigid part and a relatively flexible part, an means parts foradjusting the length of the shoe.

23. A substantially annular brake shoe comprising separable parts 'oinedtogether end to end, one of said parts ein relatively rigid and theother of said partseing relatively lexible.

24. A brake shoe comprising two separable parts joined together end toend, one of said parts having inwardly extending reinforcing meansrendering 1t relatively ri id, the other of said parts bein essentiallyat and curved and relatively exible.`

In testimony whereof, yI hereunto a-Hix my signature.

JOHN SNEED.

of-progressively decreasing flexibility from a point near the middlevthroughout said channeled part to one end, and means positioned remotefrom the ends of the shoe at said point for adjusting the length of theshoe.

17. A substantially annular brake shoe of progressivel decreasingflexibility from a point near t e middle to one end, and meanspositioned remote from the ends of the shoe at said point for adjustingthe length of the shoe.-

18. A brake shoe formed substantially as a split ring and comprising twoparts, one part being flexible relative to the other part and meansadjustably secured to one part for joining the parts together.

19. A brake shoe formed substantially as a split ring and comprising twoparts, one partbeing flexible relative to the other part and means fixedto the relatively flexible part and adjustably'secured to the other partfor joining the parts to ether.

20. A brake shoe aving a part channeled in cross section with inwardlyextending ra-

